.zong{
    display: flex;
}
.neirong{
    position: absolute;
    width: 70%;
    margin-left: 15%;
    height: 600px;
    font-size: 20px;
}
.tu1{
    background-image: url("./images/zhengzhou1.jpg");
    width: 33%;
    height: 300px;

}
.tu2{
    background-image: url("./images/zhengzhou2.jpg");

    width: 33%;
    height: 300px;
}
.tu3{
    background-image: url("./images/zhengzhou3.jpg");
    width: 33%;

    height: 300px;
}